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estimate of increased methane emission from 20 Tg per year in 2008 to 35 Tg per year in 2014. A large portion of methane emissions can be contributed by only a few "super-emitters". The annual ethane emission increase rate in North America between 2009 and 2014 was 3-5%. It has been suggested that 62% of atmospheric ethane originates from leaks associated with natural gas production and transportation operations. It has also been suggested that ethane emissions measured in Europe

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